which structure is/are considered as semiautonomous organelle?

Options

A. Ribosomes
B. Golgi body
C. Mitochondria and choroplast
D. Mitochondria only

Answer

### Step-by-Step Solution:

1. **Understanding the Term "Semi-Autonomous Organelle":**
- Semi-autonomous organelles are those organelles that possess their own DNA and can replicate independently of the cell's nucleus. This characteristic allows them a degree of autonomy in their functions.

2. **Identifying the Structures:**
- The question provides several options: ribosome, bulky body, mitochondria, chloroplast, and mitochondria only. We will evaluate each of these structures to determine if they fit the definition of semi-autonomous organelles.

3. **Evaluating Each Option:**
- **Ribosome:**
- Ribosomes are the sites of protein synthesis in the cell. However, they do not contain their own DNA and cannot replicate independently. Therefore, ribosomes are **not** considered semi-autonomous organelles.

- **Bulky Body:**
- The term "bulky body" is not a standard term in cell biology and does not refer to a recognized organelle. Furthermore, it does not contain its own DNA. Thus, this option is also **not** a semi-autonomous organelle.

- **Mitochondria:**
- Mitochondria are known as the powerhouse of the cell. They contain their own DNA and can replicate independently of the nucleus. Therefore, mitochondria are considered semi-autonomous organelles.

- **Chloroplast:**
- Similar to mitochondria, chloroplasts are involved in photosynthesis and also contain their own DNA. They can replicate independently of the nucleus, making them semi-autonomous organelles as well.

4. **Conclusion:**
- Based on the evaluations, both mitochondria and chloroplasts qualify as semi-autonomous organelles. Therefore, the correct answer to the question is that mitochondria and chloroplasts are considered semi-autonomous organelles.

### Final Answer:
**Mitochondria and chloroplasts are considered semi-autonomous organelles.**

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